Lect01S2011 - Introduction Introduction George Wong,...

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Introduction Introduction George Wong, Mycologist St. John Plant Science Building Office: 612B Office Hour: Wednesdays, 3:30 or TBA Telephone: X63940 Email: gwong@hawaii.ed
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Introduction Introduction George Wong, Mycologist Biodiversity of Protists, Fungi and Plants. Anatomy and development of plants Plant nutrition Plant hormones and influence on development
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Things You Should Know Things You Should Know Mitosis vs meiosis meiosis Prokaryotes Prokaryotes vs Eukaryotes Eukaryotes Three types of life cycles life cycles Classification of organisms , , i.e. kingdoms, phyla, etc. i.e. kingdoms, phyla, etc.
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Summary Summary Mitosis vs meiosis meiosis Mitosis Mitosis : Division of one into : Division of one into two genetically identical two genetically identical nuclei. nuclei. Meiosis Meiosis : Division of one : Division of one diploid diploid into four genetically different into four genetically different nuclei. nuclei. Random assortment Random assortment Crossing over Crossing over
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Summary Summary Following events must occur in sexual life cycle: Gamete (1N) formation. Fertilization (=syngamy). Zygote (2N) formation. Meiosis halves chromosome to 1N. Note number of chromosomes stays the same.
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Types of Life Cycles Types of Life Cycles
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Summary Summary Where and when meiosis occurs determines type of life cycle! Types of life cycles: Gametic : “Animal” life cycle Zygotic : “Most fungi and protist” life cycle Sporic : “Plant” life cycle
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Gametic Life Cycle Gametic Life Cycle Gametes are product of meiosis ! ! Gametes only haploid structure in life cycle!
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Example of Gametic Cycle Example of Gametic Cycle Human life cycle . . Only sperm and egg haploid . .
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Zygotic Life Cycle Zygotic Life Cycle Zygote undergoes meiosis ! ! Thus, zygote is the only diploid stage in life cycle!
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Example of Zygotic Cycle Example of Zygotic Cycle Chlamydomonas life cycle, a unicellular alga . . Zygote undergoes meiosis ! ! Remainder of life Remainder of life cycle is haploid. cycle is haploid.
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Sporic Life cycle Sporic Life cycle Spores Spores are the product of meiosis ! ! Alternation of Alternation of generations: In generations: In plants plants multicelled multicelled sporophyte sporophyte (2N) (2N) and and gametophyte gametophyte (1N) (1N)
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Example of Sporic Cycle Example of Sporic Cycle Laminaria , a multicelled alga ! ! Multicelled
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This note was uploaded on 08/09/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Lect01S2011 - Introduction Introduction George Wong,...

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